Question:
Identify the catalyst used in the Friedel crafts acylation reaction.
Identify the catalyst used in the Friedel crafts acylation reaction.
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A strong Lewis acid forms the acylium ion.
Updated On: Oct 1, 2026
- Anhydrous \(\text{AlCl}_3\)
- Anhydrous \(\text{FeCl}_3\)
- \(\text{NaNO}_2\)
- Alcoholic KOH
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The Correct Option is A
Solution and Explanation
Step 1: Recall the reaction
Friedel-Crafts acylation introduces an acyl group onto a benzene ring using an acid chloride or anhydride.
Step 2: Catalyst
Anhydrous \(AlCl_3\) is a Lewis acid. It helps generate the acylium ion \(RCO^+\) from \(RCOCl\), which attacks the ring.
\(FeCl_3\) is used in halogenation. \(NaNO_2\) is used in diazotisation. Alcoholic KOH is used for elimination.
Final Answer:
Anhydrous AlCl3 is the catalyst. \[ \boxed{\text{(A)}\ \text{Anhydrous }AlCl_3} \]
Friedel-Crafts acylation introduces an acyl group onto a benzene ring using an acid chloride or anhydride.
Step 2: Catalyst
Anhydrous \(AlCl_3\) is a Lewis acid. It helps generate the acylium ion \(RCO^+\) from \(RCOCl\), which attacks the ring.
\(FeCl_3\) is used in halogenation. \(NaNO_2\) is used in diazotisation. Alcoholic KOH is used for elimination.
Final Answer:
Anhydrous AlCl3 is the catalyst. \[ \boxed{\text{(A)}\ \text{Anhydrous }AlCl_3} \]
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